Jargon Buster - D
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Process that is used to remove limescale (calcium carbonate) from heat exchanger waterways.
A device using differential pressures to operate or function . Common applications in a boiler are the diverter valve and air pressure switch.
A digital programmer has an electronic display, but does the same job as the time clock. It may have separate controls for the heating and hot water.
A radiator with two heating panels.
Drain the system
Term used when water from a central heating system is to be purposefully emptied.
A device to drain a system.
Ducted warm-air system (AGS)
A system using ducting to distribute the heating air.
Enclosure designed to accommodate water pipes and fittings, electrical cables and other services.